Reduction gear



FIG. 1 is a first perspective view of a reduction gear;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof, the opposite side being a mirrorimage of the side shown herein;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict portions of the reduction gear in which thedesign is embodied that are not considered part of the claimed design.

CLAIM The ornamental design for a reduction gear, as shown anddescribed.